/**
    Copyright (C) 2012 Guido Ludwig

    This file is part of JATT.
	http://code.google.com/p/jatt/

    JATT is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package de.guidoludwig.jatt.chain.commands;

import java.io.File;
import java.io.IOException;

import org.apache.sanselan.ImageReadException;
import org.apache.sanselan.ImageWriteException;

import de.guidoludwig.jatt.JATT;
import de.guidoludwig.jatt.chain.JATTContext;
import de.guidoludwig.jatt.chain.commands.config.ExtractArtworkConfig;
import de.guidoludwig.jatt.util.ArtworkFilenameFilter;
import de.guidoludwig.jatt.util.AudioInfo;

/**
 * @author Guido Ludwig
 */
public class ExtractArtworkCommand extends JATTCommand<ExtractArtworkConfig> {

	private static final String MARKER = ".EXTRACTED";

	@Override
	protected boolean execute0(JATTContext context) {
		if (getConfig().isSkipIfFolderImageExists() && context.hasFolderImage()) {
			return false;
		}
		for (AudioInfo info : context.getTagged()) {
			String filename = ArtworkFilenameFilter.FOLDER_PREFIX + MARKER;
			try {
				File newImage = writeImageToFile(context, info, filename);
				if (newImage != null && newImage.exists()) {
					context.addToAlternativeImages(newImage);
					break;
				}
			} catch (UnsupportedOperationException | ImageReadException
					| ImageWriteException e) {
				JATT.error(e);
			}
		}
		return false;
	}

	private File writeImageToFile(JATTContext context, AudioInfo info,
			String filename) throws UnsupportedOperationException,
			ImageReadException, ImageWriteException {
		if (!info.isArtworkTagged()) {
			return null;
		}
		try {
			File newImage = info.writeImageToFile(
					context.getWorkingDirectory(), filename, getConfig()
							.isOverWriteFolderImage());
			return newImage;
		} catch (IOException e) {
			JATT.error(e);
		}
		return null;
	}

}
